Mounting for grinding-machine spindles



C. H. NORTON.

MOUNTING FOR GRINDING MACHINE SPINDLES- APPLICATION FILED JUNE 3. 1919.

1,382,606, Patented June 21, 1921.

|NVENTOR I tions. Further objects will be apparent.

- UNITED STATES PATENT OFFICE.

CHARLES H. NORTON, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO NORTON COM-PANY, OF WORCESTER, MASSACHUSETTS, A. CORPORATION OF MASSACHUSETTS.

MOUNTING FOR GRINDING-MACH NE SPINDL-ES.

Specification of Letters Patent. Patented J 11119 21, 1921 Applicationfiled June a, 1919. Serial m5. 301,548.

To all wkom z't may concern:

Be it known that I, CHARLES H. NORTON, a citizen of the United States ofAmerica, residing at Worcester, in the county of Worcester and State ofMassachusetts, have invented certain new and useful Im rovements inMountings for Grindingachine Spindles, of which the following is a full,clear, and exact specification.

My invention relates to the mounting of pulleys, gears or sprockets onthe spindles of cylindrical grinding machines.

Long experience has shown that the ordinary key or set screw mountingdoes not secure the results necessary in cylindrical grinding. but thateventually the pulley or ear becomes loose enough to cause blemishes 1nthe highly finished surfaces of the work ground. Therefore, it has beennecessary to so fit the surface of thehole to the surface of the spindleby hand scraping that when in place the pulley and spindle becomepractically one solid piece. They cannot be forcedtogether in the old,wellknown way, because the pulley or gear must be removed frequently,and et we must secure the same result as if orced together. For thesereasons it has been impossible to interchange thepulleys and spindles ofwell made cylindrical grinding machines.

It is accordingly an object of my invention to'provide such a necessaryrigid connection between a pulley and its spindle and yet enable one toutilize interchangeable arts and mount a pulley accurately at a owexpense and by means of simple operafrom the following disclosure.

Referring to the drawing, the figure is a section, with parts shown inelevation, of a pulley mounted on a grinding wheel spindle, as embodyingone base ofmy Invention.

In accordance with this inventlon, I provide a pulley, or a gearsprocket, or other similar member adapted to be fixed relative to aspindle on a rinding machine, with a hole which is considerably largerthan the spindle -on which it is to be mounted, so that there is nonecessity for accurately fitting these parts together, and I wedge thepulley on the spindle by means of two cone members which are adapted tobe forced into intimate engagement with the inner surface of the holeand the outer surface of the spindle.

In the construction illustrated, the spindle 1 ispreferably providedwith a smooth cylindrlcal portion 2 on which the pulley 3 is to bemounted. The pulley, which may be 'of the usual construction, comprisesa web 4 and hub 5 having an inner surface, which has been made of largercircumference than that of the spindle over which it is to be mounted,these sizes being so proportioned that my conical wedges may be forcedto a sufficient distance between the pulley and the spindle-to hold thepulley in place.

In order to provide a driving connection between the spindle and thepulley and to center the latter accurately, I provide a beveled and'enga ing a corresponding bevel on the collar. T is collar comprises aninwardly tapering conical portion 13 which is preferably provided with aplurality of slots 14,- equidist-antly spaced around the cone, therebyforming separated clamping fingers or wedges. The bevel of this cone orthe fingers is such as to provide a gradually sloping surface or a thinwedge 50 that the cone may be forced to a considerable distance betweenthe spindle and the hub and center the latter and fix it firmly inplace. ,The inner surface of the hub is also preferably provided at itsends with tapering or beveled portions 15 which should have the sameangle of slope as the cone against which it is adapted to be fitted. i

In order to support and center the opposite end of the hub, a secondcollar 16 is provided. This also has a ta erin or separated fingers 17 aapte to engage the adjacent inner beveled surface of the pulley. Inorder to force the cones into place, I provide a nut adapted tocooperate with threads 18 on the spindle. 'This nut is preferably madeintegral with the conical collar in orderthat the wedge fingers may beremoved as-well as forced into place Withsplit cone out difliculty. Forthis purpose, I form a head 19 on the collar 16 and provide it withslots 20 adapted to be engaged bya spanner wrench, or the collar may bemanipulated and adjusted by other suitable means. The

fingers are not threaded but are freely movtating parts. It is necessaryin this art that the pulley be accurately made and balanced and that thespindle be rotated without vi-' bration. My construction as describedpermits this balance to be easily obtained.

The method of assembling this device is obvious. By means of such aconstruction, I may first locate the cone 10, then put the pulley inplace and give it a driving connection with the spindle merely bytighten' ing up the outer adjustable collar 16 which in its forwardmovement forces the pulley not only against the opposite cone but alsoupon the fingers of the adjustable collar itself. By this means thepulley is not only given a driving connection with the spindleordinarily without the aid of a key but it is accurately centered, dueto the fact that it is supported at both ends of the hub by the conesand since the latter are of uniform thickness throughout. In order toremove the pulley it is merely necessary to apply a wrench or other toolto the head 19 and turn the cone portion out from engagement with thepulley, after which the latter may be taken off from the other cone. Anew pulley may be inserted or the old one may be replaced and accuratelycentered and otherwise positioned.

It is to be noted that the term-pulley is used broadl in this casetocover not only what is or inarily known as a pulley but also gears,sprockets, etc., which are mounted on a s indle for transmittingrotative motion. his invention has been described as applied to agrinding machine spindle since this is a machine in which the spindlecarrying the grinding wheel must be mounted accurately and rotated at ahigh velocity without vibration and in which refinement of operation andextreme accuracy in results is necessary.

What I claim is :1. In combination, a grinding machine spindle, a pulleyhaving'a hole mounted on and spaced from the spindle, a wedge shapedpart projecting between one end of the hole and the spindle, a collaradjustably mounted on the spindle and provided with inwardly projecting,separated, wedge shaped fingers adapted to extend between the spindleand the opposite end of the hole and means for moving the adjustablecollar to force said fingers between the pulley and the spindle wherebythe pulley may be fixedly mounted and centered on the spindle for adriving connection.

2. In combination, a grinding machine spindle, a pulley, a hub thereonprovided with a hole having inwardly tapering surfaces adjacent totheends thereof, said hub being loosely mounted on the spindle, a collarmovably mounted on said spindle and having inwardly tapering, separatedfingers projecting between the spindle and one of said taperingsurfaces, means to limit the axial movement of said collar, anadjustable collar having inwardly tapering separated fingers engagingthe other tapering surface of the hub and means for moving theadjustable collar to force said fiiigers between the spindle and pulleyhub or for withdrawing the same therefrom, whereby the pulley may beremovably-mounted on the spindle and centered for a driving connection.

3. In combination, a grinding machine spindle having a cylindricalsurface, a. pulley, a hub thereon provided with a hole having inwardlytapering surfaces adjacent to the ends thereof, said hub being mountedon and spaced from the spindle, a collar slidably fitted on said spindleand having inwardly tapering, spaced fingers projecting between thespindle and one inwardly tapering surface of the hub, a shoulder on thespindle adapted to limit thelongitudinal movement of said collar, anadjustable collar comprising inwardly tapering, separated fingersengaging the other tapering surface of the hub, said collar being screwthreaded and cooperating with threads on the spindle whereby it may beadjusted to force-the tapering fingers firmly between the hub andspindle and center the pulley for driving purposes and for removing thesame therefrom.

Signed at Worcester, Massachusetts, this 2nd day of June,'1919.

. CHARLES H. NORTON.

